JP4718220B2 - Concrete base material - Google Patents

Description

  The present invention relates to a concrete base material. More specifically, the present invention relates to a concrete base material that is excellent in workability and concrete coverage, and a concrete base preparation method using the same.

  In concrete structures such as water and sewage facilities and general buildings, anti-corrosion treatment is performed by a lining method or a sheet lining method in order to prevent corrosion. For example, in the lining method, it is applied in steps of concrete pretreatment, surface treatment, substrate preparation treatment (or substrate adjustment treatment and primer treatment), and anticorrosion coating layer treatment. Here, the base material adjustment means that the concrete surface (base material) to which the anticorrosion coating is applied is made flat and dense, and the concrete surface is modified based on blocking the movement of moisture from the concrete. By adjusting the substrate, the upper anticorrosion coating layer has a uniform thickness, and at the same time, the occurrence of defects such as bubbles and pinholes in the anticorrosion coating layer is prevented, and further, damage due to deterioration of the concrete and the anticorrosion coating layer is prevented. The adhesion stability (durability) of the layer can be ensured. As the substrate preparation material used for the substrate preparation, a two-pack type epoxy resin composition containing a permeable silicic acid powder, a polymer cement mortar containing silica sand and the like are known (for example, see Patent Document 1).

Japanese Patent Laid-Open No. 9-59051

  However, when the above-mentioned base material is used, when the moisture content of the concrete base is large, or when the base material has many irregularities, swelling, pinholes, and cracks occur, which is substantially the purpose of base preparation. There was a case that was not fulfilled. In addition, since a large amount of inorganic material such as silica sand is contained, work such as troweling becomes very hard work, and thus a base material having excellent workability and a concrete base adjusting function has been desired.

The inventors of the present invention have arrived at the present invention as a result of intensive studies to solve the above problems.
That is, the present invention comprises a resin composition containing an epoxy resin (A), an amine curing agent (B), a silicone foam stabilizer (C) and a thixotropic agent (D), and a concrete characterized by comprising air bubbles. A base material for adjusting a base material; a hardened material obtained by curing the base material for adjusting material; and applying the base material for adjusting material to concrete and curing the base material by heating at room temperature or by heating. Is the method.

The concrete base material of the present invention, the base material adjustment method using the same, and the cured product have the following effects.
(1) The substrate-adjusting material is excellent in adhesiveness even when the substrate has a large amount of moisture, or when the substrate has many irregularities, and does not generate pinholes and has an excellent substrate-adjusting function.
(2) Since the base material is in a mousse shape containing bubbles, it is excellent in coating workability.

The epoxy resin (A) in the present invention is a polyepoxide having two or more epoxy groups, and (A) includes the following (A1) to (A6) and mixtures thereof.
(A1) Glycidyl ether (A11) Poly (2 to 6 or more) phenol poly (2 to 6 or more) glycidyl ether divalent phenol [carbon number (hereinafter abbreviated as C) 6 to 30 ], For example, monocyclic phenols (catechol, resorcinol, etc.) and polycyclic phenols [condensed polycyclic phenols (dihydroxynaphthalene, etc.), bisphenols (bisphenol A, -F, etc.), halogenated bisphenols (dichlorobisphenol A, tetra Diglycidyl ether such as chlorobisphenol A), biphenyl (tetramethylbiphenyl, etc.), diglycidyl ether obtained from the reaction of 2 mol of bisphenol A and 3 mol of epichlorohydrin; and trihydric to hexavalent or higher polyhydric phenol [C6-number Average molecular weight [hereinafter abbreviated as Mn. Measurement is performed by gel permeation chromatography (GPC) method] 5,000] polyglycidyl ether, for example, triglycidyl ether of trivalent phenol [pyrogallol, dihydroxynaphthylcresol, tris (hydroxyphenyl) methane, etc.], tetravalent phenol. Tetraglycidyl ether of [tetrakis (4-hydroxyphenyl) ethane, etc.], hexavalent or higher polyhydric phenol [phenol or cresol novolak resin (Mn 200 to 5,000), polyvalent obtained by condensation reaction of resorcin and acetone Polyglycidyl ether of phenol (Mn 400 to 5,000, etc.).

(A12) Poly (divalent to octavalent or higher) poly (divalent to octavalent or higher) glycidyl ether low molecular polyol (having an OH equivalent of less than 250), high molecular polyol (OH of 250 or higher) And poly (divalent to octavalent or higher) glycidyl ethers of divalent to octavalent or higher polyols, including mixtures of two or more thereof.
The low molecular polyol includes polyhydric alcohols and low molecular OH-terminated polymers [polyether polyol, polyester polyol and polyurethane polyol (hereinafter abbreviated as PT polyol, PS polyol and PU polyol)].

  Polyhydric alcohols include dihydric alcohols (C2-20 or higher), such as C2-12 aliphatic dihydric alcohols [(di) alkylene glycols such as ethylene glycol, diethylene glycol, propylene glycol, dipropylene glycol, 1, 2 2-, 2,3-, 1,3- and 1,4-butanediol, 1,6-hexanediol, neopentyl glycol and 3-methylpentanediol (hereinafter referred to as EG, DEG, PG, DPG, BD, HD, respectively) , NPG and MPD), dodecanediol, etc.]; C6-20 alicyclic dihydric alcohol [1,4-cyclohexanediol, cyclohexanedimethanol, hydrogenated product of the polyhydric phenol, etc.]; C8-20 Aromatic aliphatic dihydric alcohol [xylylene glycol, bis (hydro Xylethyl) benzene and the like]; trihydric to octahydric or higher polyhydric alcohols such as (cyclo) alkane polyols and intramolecular or intermolecular dehydrates thereof [glycerin, trimethylolpropane, pentaerythritol, sorbitol and dipentaerythritol. (Hereinafter abbreviated as GR, TMP, PE, SO and DPE), 1,2,6-hexanetriol, erythritol, cyclohexanetriol, mannitol, xylitol, sorbitan, diglycerin and other polyglycerins, etc.], sugars and their derivatives [ For example, sucrose, glucose, fructose, mannose, lactose, and glycoside (such as methyl glucoside)].

  Examples of the low molecular weight OH-terminated polymer include a low-polymerization alkylene oxide (hereinafter abbreviated as AO) ring-opening polymer and a low-mol AO adduct of a polyfunctional compound containing active hydrogen atoms [for example, polyethylene glycol, polypropylene glycol, polytetra Methylene glycol (hereinafter abbreviated as PEG, PPG, PTMG), etc., bis (hydroxyethoxy) benzene and bisphenol A EO 2-4 mol adduct], low condensation degree polycondensation polyester polyol and polyhydric alcohol low mol lactone adduct [ Condensates of polycarboxylic acids with excess (1 mol per carboxyl group) polyhydric alcohol (eg dihydroxyethyl adipate) and 1 mol caprolactone adduct of EG], and low degree of PU polyols [polyisocyanate and excess (Isocyan It contains over reaction products of polyhydric alcohols bets groups per 1 mol) (e.g. the reaction product of TDI per mole and EG2 mol).

  The polymeric polyol usually has an OH equivalent weight (molecular weight per OH based on OH number) of 250 to 3,000 or more. The polyol usually has a Mn of 500 to 5,000 or more, preferably 700 to 4,500, preferably 500 to 6,000, particularly 700 to 4,000 (hereinafter referred to as Mw). Abbreviation, measured by GPC method). Examples include OH-terminated polymers [PT, PS, polyamide, PU, vinyl polymers (hereinafter abbreviated as VP) and polymer polyols (hereinafter abbreviated as P / P)], and mixtures of two or more thereof. It is.

(A2) Glycidyl ester Divalent to hexavalent or higher, aromatic (C6 to 20 or higher), aliphatic (C4 to 20 or higher) and alicyclic polycarboxylic acid (C6 to 50 or higher) ) Poly (divalent to hexavalent or higher) glycidyl ester, and the like.
(A21) Polyglycidyl ester of aromatic polycarboxylic acid Ortho-, iso- and terephthalic acid diglycidyl ester and the like;
(A22) Aliphatic or alicyclic polycarboxylic acid polyglycidyl ester Dimer acid diglycidyl ester, diglycidyl oxalate, diglycidyl malate, diglycidyl succinate, diglycidyl glutarate, diglycidyl adipate, diglycidylpi Melate, (co) polymer of glycidyl (meth) acrylate, polyglycidyl ester of polymerized fatty acid (C8-30), etc .;

(A3) Glycidylamine Divalent to 10-valent or higher poly (divalent to 10-valent or higher) glycidyl aromatic (C6-20 or higher) and aliphatic amine (C2-20 or higher) Specific examples include amines and the like.
(A31) Aromatic amine polyglycidylamine N, N-diglycidylaniline, N, N-diglycidyltoluidine, N, N, N ′, N′-tetraglycidyldiaminodiphenylmethane, N, N, N ′, N ′ -Tetraglycidyldiaminodiphenylsulfone, N, N, N ', N'-tetraglycidyldiethyldiphenylmethane, N, N, O-triglycidylaminophenol, triglycidyl-p-alkylaminophenol and the like;
(A32) Aliphatic amine polyglycidylamine N, N, N ′, N′-tetraglycidylxylylenediamine and hydrogenated compounds thereof, N, N, N ′, N′-tetraglycidylhexamethylenediamine, trisglycidylmelamine etc;

(A4) Other chain aliphatic polyepoxides Epoxidized (2 to 4 valent) polybutadiene (Mn 3,000 to 10,000), epoxidized (2 to 4 valent) soybean oil (Mn 300 to 5,000), etc .;
(A5) Other cycloaliphatic polyepoxides Cycloaliphatic poly [2-4 or higher] epoxides (Mn90-2,500), such as vinylcyclohexene dioxide, limonene dioxide, dicyclopentadiene dioxide, bis (2 , 3-epoxycyclopentyl) ether, ethylene glycol bisepoxy dicyclopentyl ether, 3,4 epoxy-6-methylcyclohexylmethyl, 3 ′, 4′-epoxy-6′-methylcyclohexanecarboxylate, bis (3,4-epoxy -6-methylcyclohexylmethyl) adipate, bis (3,4-epoxy-6-methylcyclohexylmethyl) butylamine and the like;
(A6) Urethane-modified epoxide A reaction product of a terminal urethane-group polyether urethane oligomer (Mn 1,000 to 10,000) and glycidol.

  Of the above (A), (A1) is preferable from the viewpoint of coating workability of the base material, (A11) is more preferable from the viewpoint of chemical resistance and mechanical strength, and bisphenol (bisphenol A) is particularly preferable. , -F, etc.).

In the number of epoxy groups in (A), the lower limit is preferably 2 to 10 from the viewpoint of mechanical strength and chemical resistance of the cured product, and the upper limit is preferably 2 to 10, more preferably 2 from the viewpoint of coating workability of the base material. ~ 6.
In addition, the epoxy equivalent (Mn per epoxy group) of (A) is lower in terms of the adhesive strength (particularly internal stress) of the cured product, and the upper limit is in terms of the mechanical strength and chemical resistance of the cured product. Preferably it is 112-500, More preferably, it is 136-300.

The amine curing agent (B) in the present invention includes the following (B1) to (B6) and mixtures thereof.
(B1) Aliphatic poly (2-10) amine (C2-C36)
Alkylene (C2-6) diamine (ethylenediamine, 1,2- and 1,3-propylenediamine, tetramethylenediamine, hexamethylenediamine, etc.), poly (2-6) alkylene (C2-6) polyamine [diethylenetriamine, iminobis Propylamine, bis (hexamethylene) triamine, triethylenetetramine, tetraethylenepentamine, pentaethylenehexamine, etc.]; alkyl (C1-4) or hydroxyalkyl (C2-4) substituted products of these alkylene polyamines [dialkyl (C1 -4) aminopropylamine, trimethylhexamethylenediamine, aminoethylethanolamine, methyliminobispropylamine, etc.]; alicyclic or heterocyclic-containing aliphatic polyamine (C6-15) [1,3-bisaminomethy Cyclohexane, 3,9-bis (3-aminopropyl) -2,4,8,10-tetraoxaspiro [5,5] undecane, etc.]; aromatic ring-containing aliphatic polyamine (C8-15) (xylylenediamine, Tetrachloro-p-xylylenediamine, etc.);
(B2) Alicyclic poly (2-6) amine (C4-15)
1,3- and 1,4-diaminocyclohexane, isophoronediamine, menthanediamine, 4,4′-methylenedicyclohexanediamine (hydrogenated methylenedianiline) and the like;
(B3) Heterocyclic poly (2-6) amine (C4-15)
Piperazine, N-aminoethylpiperazine, 1,4-diaminoethylpiperazine and the like;

(B4) Polyamide polyamine (Mn 200 to 2,000)
Low molecular weight polyamide obtained by condensation reaction of dicarboxylic acid (C24-44, for example, dimer acid) and excess (2 mol or more per 1 mol of dicarboxylic acid) polyamine [above (B1), (B2), (B3) etc.] Polyamines, etc .;
(B5) Polyether polyamine (Mn 200 to 1,000)
Hydrides of polyether polyols [PEG, PPG, PTMG, etc.] obtained by cyanoethylating both ends;
(B6) Cyanoethylated polyamine (C2-36)
Cyanoethylated polyamines (biscyanoethyldiethylenetriamine, etc.) obtained by addition reaction between acrylonitrile and polyamines [above (B1), (B2), (B3), etc.].

  Among the above (B), (B1), (B4), (B5) and (B6) are preferable from the viewpoint of workability and curability, and (B4) is more preferable from the viewpoint of adhesiveness, particularly preferable. Is a polyamide polyamine having a Mn of 200 to 1,000.

  (C) in the present invention is a non-hydrolyzable functional group that reacts with an epoxy group and / or an amino group and does not directly bond to a silicon atom [carboxyl group, amino group, epoxy group, thiol group, (meth) acryloyl group, etc.] A foam stabilizer having the following formula: carboxyl-modified, amino-modified, epoxy-modified, thiol-modified and (meth) acryloyl-modified organopolysiloxane represented by the following general formula (1), epoxy represented by the general formula (2) / Polyether or amino / polyether modified organopolysiloxane, as well as mixtures of two or more thereof.

In Expression (1), X is, -R carboxyl group represented by ² COOH, an amino group represented by -R ² NH ₂ or -R _² NHR ² NH ^2, a thiol represented by -R ² SH Group, an epoxy group represented by the general formula (3), or a (meth) acryloyl group represented by the general formula (4); in the formula (2), Z represents the amino group or epoxy group; , —R ² O (C ₂ H ₄ O) _r — (C ₃ H ₆ O) _s R ³ ; R ¹ is a C1-4 alkyl group, R ² is a C1-4 alkylene A group, R ³ is H 2, a C1-4 alkyl or acetyl group, Me is a methyl group; a, b and c are each 0 or 1, and when a = 1 and b = 1, c = 0; x and y is a number where (x + y) is 10 to 200 and y / (x + y) is 0.01 to 0.5; r and s are r + S = 2 to 100 (including r = 0 or s = 0), p and q represent p + q = y and p / (p + q) is a number satisfying 0.01 to 0.5. ]

  Examples of commercially available modified organopolysiloxanes represented by the general formula (1) include SF-8417 (amino-modified), BY-16-849 (amino-modified), SF8411 (epoxy-modified), and SF8418 (carboxyl-modified). [All of the above are trade names, manufactured by Toray Dow Corning Silicone Co., Ltd.], X-22-164C (methacrylic modified), KF-2001 (mercapto modified), X-22-3710 (carboxyl modified) [above, All of them are trade names, manufactured by Shin-Etsu Chemical Co., Ltd.], and examples of commercially available modified organopolysiloxanes represented by the general formula (2) include SF-8421 (epoxy / polyether modified) [commodities Name, manufactured by Toray Dow Corning Silicone Co., Ltd.], X-22-3667 (epoxy / polyether modified), X-22 3939A (amino / polyether-modified) [trade names, manufactured by Shin-Etsu Chemical Co., Ltd.] and the like.

  Of the above (C), the amino / polyether-modified organopolysiloxane represented by the general formula (2) is preferable from the viewpoint of foam stability, and the epoxy / polyether-modified organopolysiloxane is more preferable. Since the organopolysiloxane represented by the general formula (2) is compatible with (A) and / or (B) at 25 ° C., it exhibits a foam stabilizing effect in a small amount, and has an epoxy group and / or amino group. Since it has a functional group that reacts, it is preferable as a foam stabilizer in the substrate conditioner of the present invention without bleeding out from the cured product during and after curing.

The Mn per functional group that reacts with the epoxy group and / or amino group of (C) is preferably from 500 to 20, preferably the lower limit is from the viewpoint of mechanical strength of the cured product, and the upper limit is from the viewpoint of bleed-out resistance. 000, more preferably 1,500 to 15,000.
The viscosity of (C) at 25 ° C. is usually 1 to 500 Pa · s, preferably 1 to 100 Pa · s, more preferably 1 to 60 Pa · s from the viewpoint of coating workability.

The thixotropic agent (D) in the present invention includes the following (D1), (D2) and mixtures thereof.
(D1) Inorganic thixotropic agents include bentonite, fine silica, and the like. Examples of commercially available products include NEW D ORBEN [trade name, manufactured by Shiraishi Kogyo Co., Ltd.], Aerosil 200 [trade name, manufactured by Nippon Aerosil Co., Ltd.] ].
(D2) Organic thixotropic agent Hydrogenated castor oil wax, calcium stearate and the like can be mentioned. Examples of commercially available products include SN thickener 4020 and SN thickener 4040 [both trade names, manufactured by San Nopco Co., Ltd.].

  The ratio of each component based on the total weight of (A) to (D) is determined from the viewpoint of coating workability, adhesiveness, and pinhole coverage of the base material of the present invention, and mechanical strength of the cured product ( A) is preferably 20 to 90%, more preferably 30 to 80%, (B) is preferably 5 to 60%, more preferably 10 to 40%, and (C) is preferably 0.5 to 15%, More preferably, it is 1 to 10%, and (D) is preferably 0.5 to 15%, more preferably 1 to 10%.

A curing accelerator (E) may be further added to the substrate-adjusting material of the present invention in order to adjust the curing rate. (E) includes phenol compounds [C6-20, such as the above polyphenols, [alkyl (C2-12)] phenol, and salicylic acid], acid esters (C1-15, such as p-toluenesulfonic acid-methyl,- Ethyl and -propyl), tertiary amines [C3-15, such as tris (dimethylaminomethyl) phenol, dimethylbenzylamine and 1,8-diazabicyclo (5,4,0) undecane], imidazole compounds (C4-20, such as 2-methyl-, 2-ethyl-4-methyl- and 2-phenyl-imidazole), dithiocarbonate compounds [2-ethylhexyl dithiocarbonate etc.] and the like. Of these, phenol compounds, acid esters, tertiary amines and dithiocarbonate compounds are preferred from the viewpoint of curing acceleration, and acid esters and dithiocarbonate compounds are more preferred.
The amount of (E) used is usually 20% or less based on the total weight of the substrate-adjusting material of the present invention, preferably 0.1 to 10%, more preferably 0.3 to 5% from the viewpoint of adhesiveness. .

  Further, the composition of the present invention includes a group consisting of an antioxidant (F1), a filler (F2), an anti-settling agent (F3), and a diluent (F4) as necessary as long as the effects of the present invention are not impaired. At least one other additive (F) selected from may be further added.

Examples of (F1) include hindered amine [bis (2,2,6,6-tetramethyl-4-piperidyl) sebacate and the like], hindered phenol [octadecyl-3- (3,5-di-t-butyl-4- Hydroxyphenyl) propionate etc.], sulfur-containing compounds [4,6-bis (octylthiomethyl) -o-cresol etc.] and the like.
(F2) includes inorganic fillers (alumina, glass beads, forastonite, acid clay, iron oxide, silica, lead chromate, nickel slag, aluminum hydroxide, calcium carbonate, carbon black, clay, talc, titanium oxide. , Quick lime, kaolin, zeolite, diatomaceous earth, etc.), organic fillers (coal tar, polyethylene powder, powder fibers (carbon fiber, aramid fiber, etc.), vinyl chloride paste resin, vinylidene chloride resin balloon, etc.).

(F3) includes inorganic compounds (magnesium silicate, etc.) and organic compounds [polycarboxylic acids (Mn 1,000-100,000, for example, polyacrylic acid, polymethacrylic acid) alkali metals (Na, K, etc.) and ammonium Salt, etc.].
(F4) includes non-reactive diluents [aromatic resins (Mn 100 to 500, such as xylene resins), (aromatic) aliphatic alcohols (C4 to 12, such as isobutyl alcohol, benzyl alcohol), high-boiling hydrocarbons ( Mineral spirits, etc.)] and reactive diluents [aliphatic alcohol (C2-16) monoglycidyl ether [glycidyl ethyl ether, glycidyl butyl ether, etc.], higher (C12-18) fatty acid monoglycidyl esters (glycidyl laurate, glycidyl oleate) Etc.)] and the like.
The amount of (F1) to (F4) used is usually 5% or less, preferably 0.5 to 3%, and (F2) is usually 20% or less based on the total weight of the substrate-adjusting material of the present invention. , Preferably 1 to 10%, (F3) is usually 5% or less, preferably 0.1 to 3%, and (F4) is usually 20% or less, preferably 1 to 10%.

  The substrate preparation material of the present invention can be produced by blending (A) to (D) and, if necessary, (E) and (F) using an ordinary mixer such as a universal mixer. It is manufactured separately by dividing it into a main agent mainly composed of (A), (C) and (D) and a curing agent mainly composed of (B) and (D). If necessary, (E) and (F) can be added and blended in advance with the main agent and / or curing agent, or these can be added and mixed as the third component when mixing the main agent / curing agent.

  The base material prepared in this way is stored in two or three liquids consisting of a main agent and a curing agent, or a main component, a curing agent, and a third component added as necessary, and is blended immediately before use. As a method of mixing each component of these substrate preparation materials, manual mixing and mechanical mixing can be mentioned, but mechanical mixing is preferable from the viewpoint of including bubbles (air) at the time of mixing, and it is used at a construction site. From the viewpoint of ease and efficient bubble incorporation, mixing with a high-speed hand mixer and an electric whisk is more preferable. The mixing time varies depending on the type of stirrer, the shape of the stirring blade, the mixing amount, and the like, but is usually 1 to 15 minutes, preferably 3 to 10 minutes.

The viscosity at 25 ° C. immediately after mixing of the substrate-adjusting material of the present invention (when about 1 minute has passed after mixing) is preferably from 0.5 to 500 Pa, the lower limit from the viewpoint of drooping, and the upper limit from the viewpoint of coating workability. · S, more preferably 1 to 100 Pa · s, particularly preferably 20 to 80 Pa · s.
Moreover, the bubble content rate (ratio of the volume of the foam to the whole volume) of the substrate adjusting material of the present invention is the specific gravity (X1) of the mixture when mixing (for example, mixing by a vacuum demixing mixer) without mixing the bubbles. ) And the specific gravity (X2) when the bubbles are physically contained, the bubble content can be obtained from the following calculation formula.

Bubble content (%) = 100 × [(X1) − (X2)] / (X1)

The bubble content of the substrate-adjusting material of the present invention is preferably 5 to 2,000%, more preferably 10 to 1, and the lower limit is from the viewpoint of coating workability and sagability, and the upper limit is from the viewpoint of pinhole coverage. 000%, particularly preferably 20 to 300%. The bubble diameter (μm) is preferably from 0.1 to 3,000, more preferably from 1 to 1,000, and particularly preferably from 1,000 to 3,000, more preferably from the viewpoint of pinhole coverage. 10-500.

  Since the substrate conditioner of the present invention contains a silicone foam stabilizer (D), it can contain closed cells efficiently by using a hand mixer commonly used in civil engineering, and is stable until curing is completed. It is. In addition, since the substrate-adjusting material of the present invention containing foam has a mousse shape, it has very little resistance to the arm applied during application such as trowel coating, and is easy to apply, and can also be applied to application surfaces of all angles. It is extremely easy to work because it is very difficult to sag.

The base material of the present invention is usually used by applying it to a concrete surface whose surface has been pretreated with a grinder or the like and curing it. The coating method is not particularly limited, but trowel coating and spray coating are preferable from the viewpoint of uniformity of coating thickness and ease of adjustment.
The coating thickness (after curing) is usually 0.01 to 20 mm, the lower limit is preferably from 0.1 to 10 mm from the viewpoint of corrosion resistance, and the upper limit is preferably from 0.1 to 10 mm from the viewpoint of economy and coating strength, and is repeated once or several times. It is painted and finished to a predetermined thickness. Examples of the curing method include a method of curing at room temperature (5-35 ° C.) for 0.5 to 7 days, a method of curing for 3 hours to 24 hours under heating (50 to 100 ° C.), etc. In the case of construction, the anticorrosion coating is usually applied after curing for 0.5 to 2 days at room temperature (5 to 35 ° C.).

When the base material of the present invention consisting of the resin composition and air bubbles of the present invention is applied to a concrete base, without generating pinholes on the base surface without depending on the temperature and moisture content of the concrete base, and Unevenness of the substrate can be flattened.
The substrate preparation material of the present invention has excellent coating workability and pinhole coating properties as described above, and also has excellent chemical resistance including adhesion to concrete substrate and acid resistance. It is very effective as an anticorrosion coating material.

EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples, but the present invention is not limited to these examples. In addition, the part in a table | surface represents a weight part.
Examples 1-4, Comparative Examples 1-3
Each component was put into a hand mixer [Ryobi Co., Ltd., PM-1103] at a blending ratio (weight ratio) shown in Table 1, and sufficiently stirred at 25 to 80 ° C. to obtain a base material adjusting material.

Epicoat 807 [Brand name, manufactured by Japan Epoxy Resin Co., Ltd., Bisphenol F
Type epoxy resin]
SF-8421 [trade name, manufactured by Toray Dow Corning Silicone Co., Ltd., epoxy / polyether-modified organopolysiloxane]
Polymide L-4051 [trade name, manufactured by Sanyo Chemical Industries, polyamidoamine, active hydrogen equivalent 105]
Aerosil 200 [trade name, manufactured by Nippon Aerosil Industry Co., Ltd., fine silica]
SN thickener 4020 [trade name, manufactured by San Nopco, hydrogenated castor oil thickener]
Ancamine K-54 [trade name, manufactured by Air Products, Tris (dimethylaminomethyl) phenol]
Neoquick DTC [trade name, manufactured by Sanyo Chemical Industries, 2-ethylhexyl dithiocarbonate, molecular weight 262]
Silica sand special 8 [trade name, manufactured by Mikawa Silica]

  For the substrate preparation materials of Examples 1 to 4 and Comparative Examples 1 to 3, the following methods are used to show the bubble content, mixed viscosity, sagging property, pot life, touch drying time, pinhole coverage, and adhesion strength. Measured with The results are shown in Table 1.

[Bubble content]
The specific gravity (X1) of the composition obtained by mixing the composition of Table 1 for 3 minutes at 25 ° C. with a vacuum mixing defoaming machine [manufactured by Shinky Co., Ltd.], and the electric whisk [manufactured by Tescom Co., Ltd., and so on. ] Is measured using a specific gravity cup [specific gravity cup described in JIS K-6833 (General Test Method for Adhesives)], and the bubble content is determined according to the above formula. calculate.
[viscosity]
Measure the viscosity of the substrate conditioner immediately after mixing (about 1 minute after mixing) at 25 ° C. with a B-type rotational viscometer.
[Sagging]
The substrate preparation material mixed by the electric whisk is applied to the upper half substrate of a 30 × 30 × 5 cm concrete plate with the application surface vertical to the ground at a thickness of 1 mm (after curing), and 1 at 25 ° C. Take care of the day. The following criteria are used to evaluate the sag of the base material after curing.
○ Dripping from the application position is less than 1 cm × Dripping from the application position is 1 cm or more [pot life]
The time when the viscosity of the substrate preparation material reaches twice the viscosity immediately after mixing after measuring the viscosity over time from 25 ° C. with a B-type rotary viscometer immediately after mixing (about 1 minute after mixing). Measure (pot life).
[Touch drying time]
The composition of Table 1 was mixed with an electric whisk similarly to the case of measuring the bubble content, and then applied to a concrete plate (30 × 30 × 5 cm, the same applies hereinafter) with a thickness of 1 mm (after curing) at 25 ° C. Curing at. According to JIS K 5400, the time during which the coated material does not adhere to the finger even when the coating film is touched with the finger (the finger touch drying time) is measured.
[Pinhole coverage]
The base material was applied on a concrete plate having a moisture content of 7% and a material age of 1 month to a thickness of about 1 mm (after curing), and cured at 25 ° C. for 1 day. After curing, the coated surface is observed and evaluated according to the following criteria.
○ No swelling or pinhole.
△ There is no pinhole but swelling.
× There is a pinhole.
[Adhesion strength]
The base material is coated on a concrete board with a moisture content of 7% and material age of 1 month (approx. 1 mm thick) (after curing), cured at 25 ° C for 7 days, and then in accordance with JIS K 5400, Kenken-type tensile tester Is used to measure the adhesion strength to the concrete plate and evaluated according to the following criteria.
○ Concrete plate failure × Interfacial debonding between concrete plate and substrate conditioner

  From the results shown in Table 1, it can be seen that the substrate-adjusting material of the present invention is excellent in workability and sagability, as well as pinhole coverage and adhesiveness with concrete.

  The substrate preparation material of the present invention is excellent in concrete substrate adjustment functions such as sagging, pinhole coverage, and adhesion to concrete, and is also excellent in workability, so that it is used in concrete construction used in sewers, roads, etc. It is widely used as a material base material or anticorrosion coating material, and is extremely useful.

Claims (8)

A concrete base material comprising a resin composition containing an epoxy resin (A), an amine curing agent (B), a silicone foam stabilizer (C), and a thixotropic agent (D) and bubbles. The substrate preparation material according to claim 1, wherein the air bubbles are physically contained in the resin composition. The substrate preparation material according to claim 1 or 2, wherein (C) is a silicone foam stabilizer having a functional group that reacts with an epoxy group and / or an amino group. The proportions based on the total weight of (A) to (D) are (A) 30 to 90%, (B) 8 to 50%, (C) 1 to 10% and (D) 1 to 10% The substrate material according to any one of claims 1 to 3. The substrate preparation material according to any one of claims 1 to 4, wherein the substrate preparation material has a bubble content of 5 to 2,000%. The substrate preparation material according to any one of claims 1 to 5, wherein the substrate preparation material has a viscosity of 0.5 to 500 Pa · s at 25 ° C. Hardened | cured material formed by hardening the base material of any one of Claims 1-6. A base material adjusting method comprising: applying the base material adjusting material according to any one of claims 1 to 6 onto concrete, and curing the base material by curing at normal temperature or by heating.